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Pages 118-136 Appendix 4 _____________________________________________________________________________________ APPENDIX 4: A survey and risk analysis of the insect fauna of Ashmore Reef National Nature Reserve and Cartier Island Marine Reserve Graham Brown Resource Protection Branch, Department of Business Industry and Resource Development, GPO Box 3000 Darwin NT 0801 [email protected] A4.1 Summary The islands of Ashmore Reef National Nature Reserve and Cartier Island Marine Reserve were surveyed for insects during June 2002 as part of an environmental risk assessment of the Reserves. The results of this and previous surveys are discussed particularly from an ecological and conservation perspective. Relatively few species were observed compared to a previous visit, and this may be due to the lateness of the season as well as the abundance of Asian house gecko on at least West Island. A4.2 Introduction Ashmore Reef National Nature Reserve is located 850 km W of Darwin, and contains three permanently emergent islands: East (12°15.74‘S, 123°05.68‘E), Middle (12°16.02‘S, 123°01.88‘E) and West (12°14.49‘S, 122°57.88‘E) Islands. Thirty six species of terrestrial plants have been record at various times on these islands (Pike and Leach 1997). Of the three islands, West Island is the most accessible. Cartier Island Marine Reserve is located approximately 46 km south east of Ashmore Reef, and has a single emergent sand cay (12°31.85‘S, 123°33.31‘E). This cay is unvegetated and contains little driftwood or flotsam. It is used extensively as a turtle nesting site. There appears to be no previous record of insects having been collected on Cartier Island. Insect collecting in Ashmore Reef National Nature Reserve has been sporadic in the past, with the most comprehensive collecting having been undertaken by: Des Pike, a former warden of the reserves, during several trips in March, April and May 1992; myself during 8-18 May 1995; and Tony Postle, Northern Australian Quarantine Strategy, Broome, during 22-25 February 2000. Only two reports (Pike 1992, Brown 1999) on the fauna have been written, with the material listed by Pike re-examined and incorporated in the report by Brown. A list of records of insects and other arthropods was also made available by Tony Postle (pers. comm.). Brown (1999) listed 127 species of insects in 67 families as well as 7 families of spiders, and one each of pseudoscorpions (order Pseudoscorpionida), centipedes (order Scolopendrida) and millipedes (order Polyxenida). The material collected by Pike (1992) was re-examined by Brown incorporated into his report (Brown 1999). Postle (pers. comm.) listed 48 species of insects in 39 families as well as a slater (order Isopoda), a tick and a mite (order Acarina), a springtail (order Collembola), and an unknown number of spiders (order Araneida) from his survey in February 2000. Most of these, apart from the ants, moths and butterflies, were only identified to family level. It should be noted that these previous collections, together with the present trip, have been short, sporadic and often not undertaken at the best times of the year to give either a true list of the resident fauna or a true picture of the ecological dynamics of the fauna from season to season, or year to year. This report lists the insects collected during 11-20th June 2002 and discusses the results in relation to previously recorded species. Particular emphasis is given to ecological and other environmental issues that are relevant to the management of these Reserves. 118 Appendix 4 _____________________________________________________________________________________ A4.3 Methods Ashmore Reef was visited from 11-20th June 2002 aboard the Australian Customs Vessel Holdfast Bay, and in the company of Ian Cowie, Botanist, Northern Territory Herbarium. The trip also included a visit to Cartier Island on 14 June. Collecting was primarily by hand or with a butterfly net, and included searching in sand, leaf litter, under rocks and logs, on plants, and by sweeping vegetation. In addition, a Malaise trap (Fig. 1) was set up on West Island at 12°14.6‘S, 122°58.2‘E. Figure 1: Malaise trap, West I. It was not possible to use additional Malaise traps on East and Middle Islands due to concerns about their effect on nesting birds, and the likelihood that they would be quickly destroyed by perching birds (especially since there appears to be a severe shortage of roosting sites on these islands). Similarly, light trapping was planned for West Island, but this was not undertaken due to the small number of insects present as well as operational issues that resulted from the ACV being moored at the outer anchorage. Yellow pan traps which are effective in collecting small ground dwelling species, were not considered for use on this trip as they were ineffective and only collected large numbers of hermit crabs when I last visited to Ashmore in May 1995. They however, may have been effective as very few hermit crabs were seen. Bird parasites were not assessed as this requires specialised bird handling techniques. Most collecting was undertaken on West Island as there were virtually no nesting birds that would be disturbed by a human presence. East and Middle Islands were only visited briefly because of the large numbers of nesting birds on the islands, and the impossibility of doing detailed surveys without stressing or harming the birds. Specific searches were made as follows: • for a general insect biodiversity survey • of the current distribution of ginger ant, Solenopsis geminata (Fabricius) • for ants, especially the crazy ant, Anoplolepis gracilipes (Smith) • for wood boring beetles, especially the families Cerambycidae and Bostrichidae • for termites, especially drywood termites of the genus Cryptotermes • for the presence of terrestrial molluscs including Giant African Snail, Achatina fulica Bowdich, and Parlogenia sp. • of the current distribution of Asian house gecko, Hemidactylus frenatus Duméril and Bibron • for the presence of other terrestrial reptiles • for the presence of rodents • for the presence of any other organism that would affect the ecology of insects and vice versa • of the public access area of West Island • of all fresh water sources • of the ACV Holdfast Bay and other boats visiting the Reserves 119 Appendix 4 _____________________________________________________________________________________ • for organisms of environmental risk to Ashmore Reef National Nature Reserve and Cartier Island Marine Reserve • for organisms of quarantine risk to Australia • of Cartier Island Marine Reserve. These searches, particularly those for specific organisms or in specific sites, were perceived to be of special interest for a risk analysis of Ashmore Reef National Nature Reserve and Cartier Island Marine Reserve. A4.4 Results The survey was too late in the season to sample the full diversity of Ashmore‘s insect fauna. Conditions on the three Ashmore islands were very dry, and with the exception of a small number of species, most insects were rare, and collecting poor. Forty eight species including 42 insects and six other terrestrial arthropods were observed or collected at Ashmore Reef National Nature Reserve. These are listed in Table 2. The unidentified dusty-wings lacewing (family Coniopterygidae) and thrips (family Thripidae) are the only new records for Ashmore Reef National Nature Reserve. Conversely there were no dragonflies (order Odonata), mantids (order Mantodea), butterflies (order Lepidoptera) or psocids (order Psocoptera) found, and relatively few species of leafhoppers and true bugs (order Hemiptera), flies (order Diptera), moths (order Lepidoptera), and wasps (order Hymenoptera). The higher taxa found are summarised in Table 1, together with those collected by Pike in March, April and May 1992, Brown in May 1995 (Brown 1999) and Postle in February 2000 (Tony Postle pers. comm.). On West Island the only common species were the moths Utethesia sp(p). (family Arctiidae), Anisodes ?obrinaria (Guenée) (family Geometridae) and the unknown pterophorid (family Pterophoridae), the grasshoppers ?Aiolopus sp. and Pycnostictus seriatus Saussure (family Acrididae) and an unknown blattellid cockroach (family Blattellidae). The Utethesia moths were associated with octopus bush, Argusia argentea argentea. The larvae of these had caused minor damage to most leaves, but only one live larva was found. One moth in good condition was also found on Argusia argentea on East Island, but there was no larval damage observed on any of the leaves. No evidence of Utethesia was found on Middle Island. The geometrid and pterophorid moths are probably associated with creepers, Ipomoea spp., and Tar Vines, Boerhavia spp., respectively, and the blattellid cockroaches with Argusia argentea. All three insects were only found on West Island, whilst the grasshoppers were common on all three islands, although their distribution may have been more patchy on East and Middle Islands. The latter were associated with grasses including Digitaria mariannensis. Apart from grasshoppers, bushflies Musca vetustissima (Walker) (family Muscidae) (Fig. 2) and small black flies, Siphunculina striolata (Wiedemann) (family Chloropidae) (Fig. 3) were also common on both East and Middle Islands. Figure 2: Bushfly on predated egg, East I. Figure 3: Chloropid flies on Argusia flowers 120 Appendix 4 _____________________________________________________________________________________ Two species of jumping spider (family Salticidae) were also relatively
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